$2 billion is a lot of money for the federal government to spend on a system that has no real oversight.

https://www.hud.gov/press/press_releases_media_advisories/HUD_No_19_003

Don't reduce the funding; make the system accountable.

Stop taking the word of service providers and administrators of these programs at face value.  Investigate homelessness; talk to homeless people and ask them what is really going on.